If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate (baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.
Shake and Bake A new and increasingly widespread technique also known as one pot, this condenses the anhydrous method's many steps and requires only a plastic soda bottle, the size of which depends on the quantity of meth the cook intends to make.
Place chicken, one piece at a time, in the bag with the shake n bake. Seal and shake the bag so that the chicken is totally coated in the breading. Remove the chicken from the bag, shaking off excess breading. Place on a cookie sheet lined with aluminum foil.